Abstract
We excite ZnO samples with two-cycle optical pulses directly from a mode-locked oscillator with average powers of several tens of milliwatts. The emitted light reveals peaks at the carrier-envelope offset frequency and at in the radio-frequency spectra. These peaks can still be detected in layers as thin as 350 nm—a step toward determining the carrier-envelope offset phase itself.
© 2002 Optical Society of America
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